Native font names replacements related improvements

[kakurasan]

Fixes #781 and potential problems in fakejapanese* verbs.

• Set proper locale when running regedit (w_register_font_replacement)
• Change existing variable names in fakejapanese*
• Unset local variables in fakejapanese*
• Support native (non-English) font names in w_register_font_replacement() and pass native font names in fakejapanese*
• Add native font name replacements in fakejapanese
• Add Chinese and Korean native font name replacements

[bsjeon]

add_register_font_replacement_unicode.txt

The Unicode registry file makes the task simpler.

[kakurasan]

Good idea, but unfortunately it doesn't work with dash (bash works). Could you fix that (and supersede this PR) ?

[bsjeon]

Replace "\xff\xfe" with "\377\376".

I hope this will be your work.

[kakurasan]

I modified w_register_font_replacement() instead of adding w_register_font_replacement_unicode() because it's quite similar to w_register_font_replacement().

Now the implementation is locale-independent and w_register_font_replacement() supports native (non-English) font names.

[austin987]

It looks like BSD doesn't support utf8/utf16le; it uses UTF-8/UTF-16LE (not sure what mac does, but that should be verified as well).

[kakurasan]

Fixed. This works on macOS:

[austin987]

I merged 3/4 commits, fakechinese now has a conflict that can be addressed as its own PR.

Sorry this took so long, I wasn't clear on how to test it before.